JP2000197096A - Base station device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the effect of failures on a service without increasing the scale of an entire device. SOLUTION: When frequencies of transmission base band signals of a plurality of channels are converted into a plurality of frequency sets by a plurality of frequency converters 102-104, where the frequencies converted by the converters 102-104 are identical for each converter but different from each other for different converter, and synthesizers (105-107) synthesizes signals with the same radio frequency outputted from each of the frequency converters 102-104 for each of 1st to n-th sectors.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code D)
The present invention relates to a base station apparatus and method for a mobile communication system using a cellular system to which an ivision multiple access (ivision multiple access) system is applied.

[0002]

2. Description of the Related Art Conventionally, as a base station apparatus and method, there is one disclosed in Japanese Patent Application Laid-Open No. 9-270828.

[0003] In a mobile communication system, a service area is divided into cells, and a base station is installed for each cell. And
The base station simultaneously communicates with a plurality of mobile stations existing in each cell in the same frequency band.

[0004] In recent years, demand for mobile radio communication such as automobile telephones and mobile telephones has been remarkably increased, and effective frequency utilization technology for securing more subscriber capacity over a limited frequency band has become important. Is coming. As a multiple access system for effective use of frequency, a CDMA system has attracted attention.

In the CDMA system, data is spread over a wide frequency band using a spreading code unique to each channel on the transmission side and multiplexed, and the multiplexed data is despread with the same code as the spreading code on the reception side. In addition, it is a method of extracting necessary data by separating it from components of other channels, and is excellent in secrecy, confidentiality, and anti-interference.

Hereinafter, the configuration of a conventional CDMA base station apparatus will be described.

FIG. 3 is a block diagram showing a configuration of a transmission system in a conventional base station apparatus.

[0008] However, in the base station apparatus shown in FIG. 3, it is assumed that the service is provided at the first to n-th sectors in the cell and the transmission frequencies f1 to fm in these sectors.

The base station apparatus shown in FIG. 3 includes a baseband transmission signal processing section 301 and frequency converters 302 to 310.
And combiners 312 to 314 and transmission amplifiers 315 to 31
7 are provided.

[0010] In such a configuration, the baseband transmission signal processing section 301 performs coding processing on the transmission signal for each channel, and further performs spread multiplexing on the first to n-th sectors and the transmission frequencies in these sectors. Processing is performed, and the multiplexed transmission baseband signal is output to frequency converters 302 to 310.

The frequency converters 302 to 310 correspond to a set that outputs transmission frequencies f1 to fm for each of the first to n-th sectors.
At 2-310, the multiplexed transmission baseband signals are converted to designated transmission frequencies f1-fm, respectively.

The transmission signals converted to the transmission frequencies f1 to fm are combined for each of the first to n-th sectors by combiners 312 to 314 and output to the transmission amplifiers 315 to 317.

Then, after being amplified to a predetermined power in the transmission amplifiers 315 to 317, it is transmitted to the first to n-th sectors.

As described above, the transmission signal is spread multiplexed,
After frequency conversion and synthesis processing are performed for each sector, power amplification is performed and transmitted as a downlink signal.

[0015]

However, in the conventional apparatus, frequency converters 302 to 304 for converting a plurality of transmission frequencies f1 to fm for each of the first to n-th sectors.
, 305 to 307, and 308 to 310 are housed in one unit to reduce the size of the entire base station apparatus. In this case, if one unit fails, the unit to which the unit is connected is connected to There is a problem that the transmitted downlink transmission stops, and in the worst case, no service can be provided.

In order to avoid such a situation, there is a configuration in which each of the frequency converters 302 to 310 is individually housed in a unit. However, in this case, there is a problem that the entire base station apparatus becomes large.

The present invention has been made in view of the above points, and has as its object to provide a base station apparatus and a method capable of reducing the influence on service at the time of failure without increasing the entire apparatus. .

[0018]

SUMMARY OF THE INVENTION According to the present invention, a plurality of frequency conversion means are individually integrated into one unit, and when this unit converts transmission baseband signals of a plurality of channels into the same radio frequency, the same radio conversion is performed. The signals are converted so that the frequencies are different for each frequency, and the signals of different radio frequencies output from the respective frequency converters are synthesized by the respective synthesizers for each transmission signal to each sector.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a first aspect of the present invention, a plurality of transmission baseband signals of a plurality of channels are converted into the same radio frequency, and at this time, a plurality of conversions are performed such that the frequencies are different from each other for each same radio frequency. The configuration includes a frequency conversion unit and a plurality of synthesis units that synthesize signals of different radio frequencies output from the plurality of frequency conversion units for each transmission signal to each sector.

According to this configuration, even if a certain frequency conversion means fails, the radio frequency from another frequency conversion means is transmitted to each sector, so that the service at the radio frequency can be continued.

According to a second aspect of the present invention, in the first aspect, each of the plurality of frequency conversion means is configured as one unit.

According to this configuration, it is possible to reduce the size of the entire base station apparatus as compared with a case where each frequency conversion means is individually housed in a unit as in the conventional configuration.

According to a third aspect of the present invention, in the first aspect or the second aspect, each of the plurality of frequency conversion means comprises:
Oscillating means, quadrature modulating means for orthogonally modulating transmission baseband signals of a plurality of channels, and mixer means for mixing a plurality of signals after the orthogonal modulation with an oscillating signal from the oscillating means and converting the signals to a radio frequency. The configuration provided is adopted.

According to this configuration, unlike a conventional configuration in which frequency conversion is performed for each transmission baseband signal, an oscillation unit is not required for each transmission baseband signal, and the frequency conversion unit is correspondingly reduced in size. Accordingly, the entire base station apparatus can be downsized.

A fourth aspect of the present invention employs a configuration in which a mobile communication system includes the base station apparatus according to any one of the first to third aspects.

According to this configuration, the same operation and effect as any one of the first to third aspects can be obtained in the mobile communication system.

According to a fifth aspect of the present invention, when converting transmission baseband signals of a plurality of channels into the same radio frequency, a plurality of frequency conversion means for converting the same radio frequency so that the frequencies are different from each other are provided. , Each unit is formed, and signals of different radio frequencies output from the individual unitized frequency conversion means are combined for each transmission signal to each sector.

According to this configuration, even if a certain frequency conversion unit fails, the radio frequency from another frequency conversion unit is transmitted to each sector, so that the service at the radio frequency can be continued. In comparison with a conventional configuration in which each frequency conversion unit is individually housed in a unit, the entire base station apparatus can be made smaller.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment) FIG. 1 is a block diagram showing a configuration of a base station apparatus according to an embodiment of the present invention.

However, in the base station apparatus shown in FIG. 1, it is assumed that the service is provided at the first to n-th sectors in the cell and the transmission frequencies f1 to fm in these sectors.

The base station apparatus shown in FIG. 1 includes a baseband transmission signal processing section 101, and frequency converters 102 to 104.
, Synthesizers 105 to 107, and transmission amplifiers 108 to 11
0.

The baseband transmission signal processing section 101 performs coding processing on the transmission signal for each channel, and further performs spread multiplexing processing for each of the first to n-th sectors and transmission frequencies in these sectors. First
To transmit to the frequency converters 102 to 104 the transmission baseband signals 111 to 119 transmitted to the nth sector (expressed for the first to nth sectors).

Each of the frequency converters 102 to 104 is individually housed in a unit. Each of the frequency converters 102 to 104 has the same transmission frequency f1 to f1 and f2 to f2, , Fm to fm.

Here, the configuration of the frequency converter 102 is shown as a representative in FIG.

The frequency converter 102 includes a quadrature modulator 201
To 203, an oscillator 204, a synthesizer 205,
Mixers 206 to 208, which are housed in a single unit.

The quadrature modulators 201 to 203 include first to n-th
I and Qch transmit baseband signals 111 for the sector
To 119 are quadrature-modulated, and the modulated transmission signals are output to mixers 206 to 208.

The oscillator 204 is an oscillator such as a crystal oscillator, and outputs an oscillation signal of a predetermined frequency to the synthesizer 205.

The synthesizer 205 converts the signal frequency from the oscillator 204 into a radio frequency, and
08.

The mixers 206 to 208 include the quadrature modulator 20
The transmission signal is mixed with the signal from the synthesizer 205 by mixing the transmission signal from
1 and outputs the converted signal of the transmission frequency f1 to the combiners 105 to 107.

The combiners 105 to 107 individually combine transmission signals of different transmission frequencies f1 to fm output from the respective frequency converters 102 to 104 for one for the same sector, and transmit the signals to the transmission amplifiers 108 to 110. Output.

That is, the synthesizer 105 includes the frequency converter 10
2, a transmission signal for the first sector including the transmission frequency f1 from the frequency converter 2, the transmission frequency f2 from the frequency converter 103, and the transmission frequency fm from the frequency converter 104, and outputs the synthesized signal to the transmission amplifier 108. .

The combiner 106 combines the transmission signals for the second sector with the transmission frequencies f 1, f 2 and fm and outputs them to the transmission amplifier 109.

The combiner 107 combines the transmission signals for the n-th sector with the transmission frequencies f1, f2 and fm, and outputs them to the transmission amplifier 110.

The transmission amplifiers 108 to 110 are
After amplifying the transmission signals from 5 to 107 to a predetermined power,
The data is transmitted to the first to n-th sectors.

In such a configuration, the baseband transmission signal processing section 101 performs encoding processing on the transmission signal for each channel, and further performs spread multiplexing for each of the first to n-th sectors and the transmission frequency in those sectors. Processing is performed, thereby multiplexing the transmission baseband signal 1
11 to 119 are output to the frequency converters 102 to 104.

In the frequency converter 102, the transmission baseband signal 111 for the first sector, the transmission baseband signal 112 for the second sector, and the transmission baseband signal 113 for the nth sector are transmitted to the designated transmission baseband. The signal is converted to the frequency f1 and output to the synthesizers 105 to 107.

In the frequency converter 103, the transmission baseband signal 114 for the first sector, the transmission baseband signal 115 for the second sector, and the transmission baseband signal 116 for the nth sector are transmitted to the designated transmission baseband. The frequency is converted to the frequency f2 and output to the synthesizers 105 to 107.

In the frequency converter 104, the transmission baseband signal 117 for the first sector, the transmission baseband signal 118 for the second sector, and the transmission baseband signal 119 for the nth sector are transmitted to the designated transmission. The frequency is converted to the frequency fm and output to the synthesizers 105 to 107.

In the synthesizer 105, the transmission frequencies f1, f2
And fm for the first sector are combined and output to the transmission amplifier 108.

In the synthesizer 106, the transmission frequencies f1, f2
And fm for the second sector are combined and output to the transmission amplifier 109.

In the synthesizer 107, the transmission frequencies f1, f2
Fm and the transmission signal for the n-th sector are output to the transmission amplifier 110.

In the transmission amplifiers 108 to 110, the synthesizer 1
After the transmission signals from 05 to 107 are amplified to a predetermined power, they are transmitted to the first to n-th sectors.

Here, a case where the frequency converter 102 has failed will be described.

When the frequency converter 102 breaks down,
The transmission frequency f1 transmitted to the n-th sector is affected. However, since the transmission frequencies f2 to fm from the other frequency converters 103 and 104 are transmitted to the first to n-th sectors, the service can be continued at the transmission frequencies f2 to fm.

As described above, according to the base station apparatus of the present embodiment, a plurality of frequency converters 102 to 104
When converting transmission baseband signals of a plurality of channels into the same radio frequency, they are converted so that the frequencies are different from each other for each of the same radio frequencies, and each of the frequency converters 102 to 104 is converted.
Signals of different radio frequencies output from
Each of the combiners 105 to 107 is configured to combine each transmission signal to the sector.

As a result, even if a certain frequency converter 102 fails, the transmission frequencies f2 to fm from the other frequency converters 103 and 104 are transmitted to the first to n-th sectors. To fm can be continued.

Therefore, unlike the conventional case, when one frequency converter fails, transmission to the sector to which the frequency converter is connected stops, and in the worst case, no service can be provided. .

Further, a plurality of frequency converters 10 having the above functions
Since 2 to 104 are individually made into one unit, each frequency converter is individually housed in a unit as in other conventional configurations, thereby preventing the entire base station apparatus from becoming large. Can be.

Also, a plurality of frequency converters 102 to 104
, An oscillator 204 and quadrature modulators 201 to 203 for quadrature modulating transmission baseband signals of a plurality of channels.
And mixers 206-2 for mixing a plurality of signals after quadrature modulation with an oscillation signal from oscillator 204 and converting the signal into a radio frequency.
08, it is not necessary to provide an oscillator for each transmission baseband signal as in a conventional configuration in which frequency conversion is performed for each individual transmission baseband signal, and the frequency converter can be downsized accordingly. This makes it possible to reduce the size of the entire base station apparatus.

Further, in the base station apparatus according to the present embodiment, when the frequency converter unit is out of order, the risks are dispersed, and therefore, it can be considered that both are active.
As a result, a base station apparatus having a redundant configuration of 0/1 is realized.

[0062]

As described above, according to the present invention,
The effect on service at the time of failure can be reduced without increasing the entire apparatus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a base station apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a frequency converter in the base station apparatus according to the embodiment.

FIG. 3 is a block diagram showing a configuration of a conventional base station apparatus.

[Explanation of symbols]

 102-104 Frequency converter 105-107 Combiner 111-119 Transmission baseband signal f1, f2, fm Transmission frequency

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 1/04 H04J 13/00

Claims (5)

[Claims] 1. A plurality of frequency conversion means for converting transmission baseband signals of a plurality of channels into the same radio frequency and converting the same radio frequency so that the frequencies are different from each other, and the plurality of frequency conversion means. And a plurality of combining means for combining signals of different radio frequencies output from each other for each transmission signal to each sector. 2. The base station apparatus according to claim 1, wherein each of the plurality of frequency conversion means is integrated into one unit. 3. A plurality of frequency converting means, each comprising: an oscillating means; an orthogonal modulating means for orthogonally modulating transmission baseband signals of a plurality of channels; and oscillating a plurality of signals after the orthogonal modulation from the oscillating means. 3. The base station apparatus according to claim 1, further comprising: mixer means for mixing the signal with a signal and converting the signal into a radio frequency. 4. A mobile communication system comprising the base station apparatus according to claim 1. 5. When converting transmission baseband signals of a plurality of channels into the same radio frequency, a plurality of frequency conversion means for converting the same radio frequency so that the frequencies are different from each other are individually unitized, and A method of configuring a base station apparatus, comprising combining signals of different radio frequencies output from the individual unitized frequency conversion means for each transmission signal to each sector.